To the thought that Jacen doesn't need redeeming.... Read the latest book, fury, that guy is hardcore darkside now, killing innocents, and doing exactly what HE wants all the time.
my theory: Ben is going to kill Jacen and end up going to the dark side. Which is stupid, because WHO IS BEN exactly? not even a knight. Notice how in the rescue mission of Allana it was BEN, not Saba, or Luke who started destroying the YVH droids? he takes out 4 of them i think. How pathetically lame is that? the writers are starting to make him a lot more of a focus, and making him way more powerful than he should be. He's going to play a bigger role in this than a fourteen year old should i think.